﻿<Canvas xmlns="http://schemas.microsoft.com/client/2007" 
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" 
        Width="250" Height="250" Background="LightSteelBlue">
  <Button Canvas.Top="10" Canvas.Left="10" Content="Button" />
  <Ellipse Canvas.Top="25" Canvas.Left="25" Canvas.ZIndex="1"
           Width="50" Height="25" Fill="Aqua" />
</Canvas>